AMR, US Airways Predict Clear Skies

After a year of rebuffs, feints and secret negotiations, the chief executives of American Airlines parent AMR Corp. and US Airways Group Inc. unveiled their long-awaited merger and vowed to work together to make the tie-up into the world's dominant carrier.

The potential combination, which must clear antitrust scrutiny, "will lift American to the top of the industry," AMR chief Tom Horton said Thursday. The merged airline...